CN102255833A - Analysis method and apparatus for uplink broadband interference - Google Patents
Analysis method and apparatus for uplink broadband interference Download PDFInfo
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- CN102255833A CN102255833A CN201010179899XA CN201010179899A CN102255833A CN 102255833 A CN102255833 A CN 102255833A CN 201010179899X A CN201010179899X A CN 201010179899XA CN 201010179899 A CN201010179899 A CN 201010179899A CN 102255833 A CN102255833 A CN 102255833A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/26—Monitoring; Testing of receivers using historical data, averaging values or statistics
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Abstract
The invention discloses an analysis method for uplink broadband interference. The method comprises the following steps: determining frames of an uplink on which broadband interference analyses are carried out; carrying out statistics on noise power of each subcarrier that is occupied by each empty slot on each frame and calculating an average noise power of subcarriers; calculating an Rssi of a system according to the average noise power of the subcarriers; and comparing the Rssi of the system and an RssiExp of the system so as to obtain a broadband interference condition of the system, wherein the Rssi is obtained by calculation. In addition, the invention also discloses an analysis apparatus for uplink broadband interference. According to the invention, broadband interference of an uplink can be accurately analyzed on the condition that there is data service and the data service is not stopped.
Description
Technical field
The present invention relates to OFDM (OFDMA) system, be meant a kind of analytical method and device of up link broad-band interference especially.
Background technology
Communication system is employed is that bandwidth range is the broadband signal of 1.5M～20M for OFDM (OFDMA, Orthogonal Frequency Division Multiple Access).For broadband system, inevitably can there be broad-band interference exactly.
The existence of up link broad-band interference has had a strong impact on that communication system is professionally set up normally, the transmission of data etc.Wideband interferer signal exists on time domain, the base station has received wideband interferer signal, when doing fast Fourier transform (FFT) simultaneously when receiving data-signal, on frequency domain, just will disturb data to be aliasing in, can't correctly obtain data when causing demodulation with actual needs.But when having data service to exist, on frequency domain, be difficult to distinguish the data-signal of wideband interferer signal and actual needs again.So in the communication system operation, how effectively discovery and identification wideband interferer signal are most important.
In the existing technology of OFDMA system, analytical method for the up link broad-band interference is that up business is stopped, at this moment the signal noise performance number that counts on of base station is exactly end value of making an uproar of system, has judged whether that according to this end value of making an uproar broad-band interference exists then.The drawback of this method will be removed all users exactly from the base station, stop the data service of up link, is forbidden in such application that operates in reality.And how under the situation that has data service to exist, the broad-band interference of up link is analyzed never fine, method very accurately.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of analytical method and device of up link broad-band interference, can have data service to exist and not stop under the situation of data service the broad-band interference of up link to be analyzed accurately.
In order to achieve the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of analytical method of up link broad-band interference, this method comprises:
Determine to carry out the subframe of the up link that broad-band interference analyzes;
Add up the noise power of each subcarrier that each empty slot takies on described each subframe, and calculate the average noise power of subcarrier;
End value of making an uproar of the average noise power computing system of the described subcarrier of foundation;
End value of making an uproar of the described system that calculates value of making an uproar of the theoretical end with system is compared, obtain the broad-band interference situation of system.
This method further comprises:
With described each subframe in zone (PUSC zone) that last 3 symbols on the time domain and 35 sub-channel distribution on frequency domain are a parton channel; And all time slots (slot) that described PUSC zone comprises are set to sky slot, do not carry out the transmission of upstream data;
The noise power of each subcarrier that each the empty slot among the described PUSC zone on described each subframe is taken is added up.
Further, the noise power of described each subcarrier of statistics is specially:
PowerSum＝I
2+Q
2；
Wherein, described PowerSum is the noise power of single sub-carrier; Described I is the real part from the frequency domain data of single sub-carrier reception; Described Q is the imaginary part from the frequency domain data of single sub-carrier reception.
Further, the average noise power of described calculating subcarrier is specially:
Determine to carry out the number M of the subcarrier that broad-band interference analyzes according to the number of described subframe,, calculate M the noise power that subcarrier is total according to the noise power of subcarrier and the number M of subcarrier
Wherein, described n is the sequence number of subcarrier, and M is a natural number;
Then the average noise power of subcarrier is:
Further, end value of making an uproar of described computing system is specially:
Rssi＝10log(RssiEverySubCarrier×N)；
Wherein, described Rssi is end value of making an uproar of system; Described N is a subcarrier number that frequency domain symbol comprised of system.
Further,, compare, be specially with value of making an uproar of the theoretical end of system with end value of making an uproar of the described system that calculates:
End value of making an uproar of the system that calculates is carried out difference computing: RssiInterfere=Rssi-RssiExp with the theoretical end value of making an uproar (RssiExp) of system;
According to the difference RssiInterfere of value of making an uproar of the theoretical end of the end value of making an uproar of described system and system, obtain the broad-band interference situation of system.
Further, obtain the broad-band interference situation of system, be specially: determine the broad-band interference situation according to the Packet Error Ratio and the described RssiInterfere that receive upstream data.
The present invention also provides a kind of analytical equipment of up link broad-band interference, and this device comprises:
Pretreatment module is used to determine to carry out the subframe of the up link that broad-band interference analyzes;
Statistical module, the noise power that is used to add up each subcarrier that each empty slot takies on described each subframe, and the average noise power of calculating subcarrier; Also be used for end value of making an uproar according to the average noise power computing system of described subcarrier;
Analysis module is used for end value of making an uproar of the described system that will calculate, and compares with value of making an uproar of the theoretical end of system, obtains the broad-band interference situation of system.
Wherein, described pretreatment module, being further used for described each subframe is a PUSC zone at last 3 symbols on the time domain and 35 sub-channel distribution on frequency domain; And all slot that described PUSC zone comprises are set to sky slot;
Accordingly, described statistical module, the noise power that is further used for each subcarrier that each the empty slot among the described PUSC zone on described each subframe is taken is added up.
Described analysis module, the end value of making an uproar that is further used for the described system that will calculate is carried out the difference computing with value of making an uproar of the theoretical end of system, and, determine the broad-band interference situation according to end value of making an uproar of Packet Error Ratio that receives upstream data and described system and the difference of value of making an uproar of the theoretical end of system.
The set of the present invention by sky slot is set in the subframe of up link, be PUSC zone, concentrate the noise power of each subcarrier that each empty slot among the PUSC zone is taken to add up, can obtain end value of making an uproar of whole system, simultaneously, the slot except PUSC zone may be used to transmission of uplink data on the subframe; Then, according to the difference of value of making an uproar of the theoretical end of the end value of making an uproar of the system that calculates and system, can determine the disturbed condition in broadband in the system, so, the present invention can have data service to exist and not stop under the situation of data service the broad-band interference of up link to be analyzed accurately.
Description of drawings
Fig. 1 is the position view of the empty slot of the present invention in a subframe;
Fig. 2 is the analytical method schematic flow sheet of up link broad-band interference of the present invention;
Fig. 3 is the analytical equipment structural representation of up link broad-band interference of the present invention.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
In the OFDMA system, if uplink sub-carrier is not all used, then terminal only can send upstream data again on the subcarrier of appointment, at this moment will be free time slot (slot) to exist.Slot is the least unit of data in the OFDMA system, as shown in Figure 1, under the situation of up PUSC, a slot is taking 3 symbols, taking 1 subchannel on frequency domain on the time domain, and one of them subchannel comprises 72 subcarriers (24 is that pilot sub-carrier, 48 are data subcarriers).
Though on empty slot, do not send upstream data, but the radio-frequency (RF) Receiving Device of network side is when receiving upstream data, still having data on these skies slot exists, these data are exactly the noise signal of surrounding environment, the power (abbreviating noise power as) of the noise signal of each subcarrier that the present invention takies these skies slot is added up, just can obtain value of making an uproar (Rssi) at the bottom of the system of whole bandwidth, judge whether to exist broad-band interference with this.
Based on above-mentioned thought, technical scheme of the present invention is achieved in that and comprises the steps: as shown in Figure 2
Supposing needs up continuous N=2,000,000 subcarrier is carried out the analysis of broad-band interference in a measurement period, because upstream data is to be unit with the subframe, and subframe takies 35 subchannels on frequency domain, a channel comprises 72 subcarriers, promptly a subframe takies 35 * 72=2520 subcarrier on frequency domain, then needs 794 subframes of about 2000000 ÷, 2502 ≈ are analyzed; In the OFDMA system, a subframe is 5ms, and a then above-mentioned measurement period is approximately 794 * 5ms=4s.
In the application of reality, can determine the number of sub-frames of statistics as required earlier, then subcarrier number M=number of sub-frames * 2520.
In addition, the present invention can also repeatedly carry out the analysis of broad-band interference according to above-mentioned definite measurement period.
In order to reduce complexity to the subcarrier noise power statistic, the present invention is provided with an empty slot set on the subframe of each statistics, it is the zone (PUSC zone) of parton channel, as shown in Figure 1, a subframe takies 15 symbols on time domain, on frequency domain, take 35 subchannels, with a subframe last 3 symbols and 35 sub-channel distribution on time domain is PUSC zone, then this PUSC zone comprises 35 slot, each slot takies 72 subcarriers, among the present invention, these 35 slot all are set to sky slot, the PUSC zone that promptly sets a subframe does not send upstream data; But other slot can be used for transmission of uplink data on this subframe.
Because PUSC zone does not send upstream data, then its 35 empty slot that comprise just do not have corresponding modulation coding mode, and the value of each empty slot corresponding modulating coded system is 0 so.
As can be seen from Figure 1, an empty slot takies 72 subcarriers, and the present invention adds up the noise power of each subcarrier that each empty slot takies.The statistics of this noise power is based on the frequency domain data of each subcarrier, comprise real part (I) and imaginary part (Q) two parts data, wherein: the radio-frequency (RF) Receiving Device of network side is when the some subcarrier of an empty slot receives data, the frequency domain data of 1 32bit will be obtained, imaginary part (Q) comprising real part (I) and the 16bit of 16bit, imaginary part has been represented the phase place of this subcarrier, and the mould value of real part and imaginary part has been represented the amplitude of this subcarrier).
The noise power PowerSum=I of this subcarrier so
2+ Q
2
Adopt this method that each empty slot among the PUSC zone on each subframe of needs statistics is carried out repeating query,, need count the noise power of M subcarrier altogether for the noise power that an empty slot need add up 72 subcarriers.
The noise power of M subcarrier counting is added up, promptly
Wherein n is the sequence number of subcarrier, and M is a natural number, and then divided by the number M of subcarrier, just can obtain subcarrier average noise power, be end value of making an uproar of each subcarrier:
Sub-carrier number N that frequency domain symbol comprised in the average noise power of M subcarrier and the OFDMA system is multiplied each other (when system bandwidth is 10M, N=1024; When bandwidth is 10M during 5M, N=512), just can obtain end value of making an uproar of system: Rssi=10log (RssiEverySubCarrier * N).
End value of making an uproar of the system that statistics is obtained is carried out the difference computing, is RssiInterfere=Rssi-RssiExp with the theoretical end value of the making an uproar RssiExp of system, judges the broad-band interference situation of system by difference RssiInterfere.
General not having under the situation of broad-band interference, for the OFDMA system, the theoretical end value of the making an uproar RssiExp of the system that obtains by emulation and actual test is about-102dB.If there is broad-band interference to exist, then the end value of the making an uproar Rssi of system will be bigger than normal, surpasses-102dB.
The present invention obtains the broad-band interference situation according to Packet Error Ratio that receives upstream data and the value of RssiInterfere, and the bandwidth interference situation is carried out grade classification, for example the broad-band interference situation is divided into 8 grades:
1, when RssiInterfere≤10, thinking no broad-band interference can not influence the normal data business;
2, when 10≤RssiInterfere≤20, thinking has slight broad-band interference, and may there be the mistake bag in transmitting uplink data, and Packet Error Ratio can be in 1%;
3, when 20＜RssiInterfere≤30, thinking has the broad-band interference of general degree, and may there be less mistake bag in transmitting uplink data, and Packet Error Ratio can be in 5%;
4, when 30＜RssiInterfere≤40, thinking has moderate broad-band interference, and may there be a spot of mistake bag in transmitting uplink data, and Packet Error Ratio can be in 10%;
5, when 40＜RssiInterfere≤50, thinking has serious broad-band interference; May there be more mistake bag in transmitting uplink data, and Packet Error Ratio can be in 50%;
6, when 50＜RssiInterfere≤60, thinking has more serious broad-band interference, and may there be very many mistake bags in transmitting uplink data, and Packet Error Ratio can be in 70%;
7, when 60＜RssiInterfere≤70, thinking has very serious broad-band interference, and may there be a large amount of mistake bags in transmitting uplink data, and Packet Error Ratio can be in 90%;
8, when RssiInterfere＞70, system noise power supersaturation that explanation at this moment receives, surpassed can demodulation performance boundary, think that upstream data basically can not normal transmission, Packet Error Ratio reaches 100%.
Based on above-mentioned grade classification, the present invention can analyze accurately to the broad-band interference of up link.
The division of above-mentioned 8 grades is a kind of embodiment, certainly, according to the actual needs, can also carry out more accurate grade classification to the disturbed condition in broadband according to the value of the Packet Error Ratio of reception upstream data and RssiInterfere.
In order to realize above-mentioned analytical method, the invention provides the device that a kind of broad-band interference is analyzed, as shown in Figure 3, comprising:
Wherein, pretreatment module 10, being further used for each subframe is a PUSC zone at last 3 symbols on the time domain and 35 sub-channel distribution on frequency domain; And all slot that PUSC zone comprises are set to sky slot, do not carry out the transmission of upstream data;
Accordingly, statistical module 20, the noise power that is further used for each subcarrier that each the empty slot among the PUSC zone on each subframe is taken is added up.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the analytical method of a up link broad-band interference is characterized in that, this method comprises:
Determine to carry out the subframe of the up link that broad-band interference analyzes;
Add up the noise power of each subcarrier that each empty slot takies on described each subframe, and calculate the average noise power of subcarrier;
End value of making an uproar of the average noise power computing system of the described subcarrier of foundation;
End value of making an uproar of the described system that calculates value of making an uproar of the theoretical end with system is compared, obtain the broad-band interference situation of system.
2. according to the analytical method of the described up link broad-band interference of claim 1, it is characterized in that this method further comprises:
With described each subframe in zone (PUSC zone) that last 3 symbols on the time domain and 35 sub-channel distribution on frequency domain are a parton channel;
And all time slots (slot) that described PUSC zone comprises are set to sky slot, do not carry out the transmission of upstream data;
The noise power of each subcarrier that each the empty slot among the described PUSC zone on described each subframe is taken is added up.
3. according to the analytical method of the described up link broad-band interference of claim 2, it is characterized in that the noise power of described each subcarrier of statistics is specially:
PowerSum＝I
2+Q
2；
Wherein, described PowerSum is the noise power of single sub-carrier; Described I is the real part from the frequency domain data of single sub-carrier reception; Described Q is the imaginary part from the frequency domain data of single sub-carrier reception.
4. according to the analytical method of the described up link broad-band interference of claim 3, it is characterized in that the average noise power of described calculating subcarrier is specially:
Determine to carry out the number M of the subcarrier that broad-band interference analyzes according to the number of described subframe,, calculate M the noise power that subcarrier is total according to the noise power of subcarrier and the number M of subcarrier
Wherein, described n is the sequence number of subcarrier, and M is a natural number;
Then the average noise power of subcarrier is:
5. according to the analytical method of the described up link broad-band interference of claim 4, it is characterized in that end value of making an uproar of described computing system is specially:
Rssi＝10log(RssiEverySubCarrier×N)；
Wherein, described Rssi is end value of making an uproar of system; Described N is a subcarrier number that frequency domain symbol comprised of system.
6. according to the analytical method of the described up link broad-band interference of claim 5, it is characterized in that,, compare, be specially with value of making an uproar of the theoretical end of system with end value of making an uproar of the described system that calculates:
End value of making an uproar of the system that calculates is carried out difference computing: RssiInterfere=Rssi-RssiExp with the theoretical end value of making an uproar (RssiExp) of system;
According to the difference RssiInterfere of value of making an uproar of the theoretical end of the end value of making an uproar of described system and system, obtain the broad-band interference situation of system.
7. according to the analytical method of the described up link broad-band interference of claim 6, it is characterized in that, obtain the broad-band interference situation of system, be specially: determine the broad-band interference situation according to the Packet Error Ratio and the described RssiInterfere that receive upstream data.
8. the analytical equipment of a up link broad-band interference is characterized in that, this device comprises:
Pretreatment module is used to determine to carry out the subframe of the up link that broad-band interference analyzes;
Statistical module, the noise power that is used to add up each subcarrier that each empty slot takies on described each subframe, and the average noise power of calculating subcarrier; Also be used for end value of making an uproar according to the average noise power computing system of described subcarrier;
Analysis module is used for end value of making an uproar of the described system that will calculate, and compares with value of making an uproar of the theoretical end of system, obtains the broad-band interference situation of system.
9. the analytical equipment of described according to Claim 8 up link broad-band interference, it is characterized in that, described pretreatment module, being further used for described each subframe is a PUSC zone at last 3 symbols on the time domain and 35 sub-channel distribution on frequency domain; And all slot that described PUSC zone comprises are set to sky slot;
Accordingly, described statistical module, the noise power that is further used for each subcarrier that each the empty slot among the described PUSC zone on described each subframe is taken is added up.
10. the analytical equipment of described according to Claim 8 up link broad-band interference, it is characterized in that, described analysis module, the end value of making an uproar that is further used for the described system that will calculate is carried out the difference computing with value of making an uproar of the theoretical end of system, and, determine the broad-band interference situation according to end value of making an uproar of Packet Error Ratio that receives upstream data and described system and the difference of value of making an uproar of the theoretical end of system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010179899.XA CN102255833B (en) | 2010-05-20 | 2010-05-20 | A kind of analytical method of uplink wideband interference and device |
| PCT/CN2010/077686 WO2011143892A1 (en) | 2010-05-20 | 2010-10-12 | Method and device for analyzing uplink broadband interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010179899.XA CN102255833B (en) | 2010-05-20 | 2010-05-20 | A kind of analytical method of uplink wideband interference and device |
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| Publication Number | Publication Date |
|---|---|
| CN102255833A true CN102255833A (en) | 2011-11-23 |
| CN102255833B CN102255833B (en) | 2015-08-12 |
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| CN201010179899.XA Expired - Fee Related CN102255833B (en) | 2010-05-20 | 2010-05-20 | A kind of analytical method of uplink wideband interference and device |
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| WO (1) | WO2011143892A1 (en) |
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| CN102421123A (en) * | 2011-11-30 | 2012-04-18 | 合肥东芯通信股份有限公司 | Method and device for detecting neighbor cell bandwidth in LTE (Long Term Evolution) system |
| CN105519019A (en) * | 2013-05-27 | 2016-04-20 | 华为技术有限公司 | Method and devie for detecting interference singal |
| CN105517169A (en) * | 2014-09-26 | 2016-04-20 | 成都鼎桥通信技术有限公司 | Scheduling method used for preventing interferences |
| CN111447020A (en) * | 2020-06-05 | 2020-07-24 | 国网信息通信产业集团有限公司 | Interference processing method and system applied to power wireless private network |
| CN112543507A (en) * | 2019-09-23 | 2021-03-23 | 成都鼎桥通信技术有限公司 | Carrier selection method, device, base station and storage medium based on uplink interference |
| CN114189297A (en) * | 2021-11-23 | 2022-03-15 | 上海移为通信技术股份有限公司 | Wireless communication device and interference detection method thereof |
| CN114726410A (en) * | 2022-03-07 | 2022-07-08 | 山东大学 | Non-uniform wave beam space modulation method and system suitable for multi-antenna communication perception integration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102421123B (en) * | 2011-11-30 | 2014-07-30 | 合肥东芯通信股份有限公司 | Method and device for detecting neighbor cell bandwidth in LTE (Long Term Evolution) system |
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| CN105517169A (en) * | 2014-09-26 | 2016-04-20 | 成都鼎桥通信技术有限公司 | Scheduling method used for preventing interferences |
| CN105517169B (en) * | 2014-09-26 | 2019-05-17 | 成都鼎桥通信技术有限公司 | It is a kind of for evading the dispatching method of interference |
| CN112543507A (en) * | 2019-09-23 | 2021-03-23 | 成都鼎桥通信技术有限公司 | Carrier selection method, device, base station and storage medium based on uplink interference |
| CN111447020A (en) * | 2020-06-05 | 2020-07-24 | 国网信息通信产业集团有限公司 | Interference processing method and system applied to power wireless private network |
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| CN114189297A (en) * | 2021-11-23 | 2022-03-15 | 上海移为通信技术股份有限公司 | Wireless communication device and interference detection method thereof |
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| CN114726410A (en) * | 2022-03-07 | 2022-07-08 | 山东大学 | Non-uniform wave beam space modulation method and system suitable for multi-antenna communication perception integration |
| CN114726410B (en) * | 2022-03-07 | 2022-09-30 | 山东大学 | Non-uniform wave beam space modulation method and system suitable for multi-antenna communication perception integration |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011143892A1 (en) | 2011-11-24 |
| CN102255833B (en) | 2015-08-12 |
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